MAX1203AEPP Maxim Integrated, MAX1203AEPP Datasheet - Page 21

• Manufacturer Part Number: MAX1203AEPP
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1203AEPP

• Number Of Channels: 8/4
• Architecture: SAR
• Conversion Rate: 133 KSPs
• Resolution: 12 bit
• Input Type: Single-Ended/Differential
• Snr: 71 dB
• Interface Type: 4-Wire (SPI, Microwire, TMS320)
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Package / Case: PDIP N
• Maximum Power Dissipation: 640 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: 4.096 V

Figure 15. Unipolar Transfer Function, 4.096V = Full Scale
(“star” ground point) at GND. Connect all other analog
grounds to this ground. No other digital system ground
should be connected to this single-point analog
ground. The ground return to the power supply for this
ground should be low impedance and as short as pos-
sible for noise-free operation.
High-frequency noise in the power supplies can affect
the ADC’s high-speed comparator. Bypass these sup-
plies to the single-point analog ground with 0.1µF and
4.7µF
MAX1202/MAX1203. Minimize capacitor lead lengths
for best supply-noise rejection. If the +5V power supply
is very noisy, a 10Ω resistor can be connected as a
lowpass filter, as shown in Figure 18.
11 . . . 111
11 . . . 110
11 . . . 101
00 . . . 011
00 . . . 010
00 . . . 001
00 . . . 000
OUTPUT CODE
bypass
0
1
2
INPUT VOLTAGE (LSBs)
______________________________________________________________________________________
3
capacitors
FULL-SCALE
TRANSITION
5V, 8-Channel, Serial, 12-Bit ADCs
FS - 3/2LSB
close
1LSB =
FS =
FS
+ 4.096V
+4.096V
to
4096
the
with 3V Digital Interface
Figure 16. Bipolar Transfer Function, ±4.096V/2 = Full Scale
Figure 17. MAX1202 Reference-Adjust Circuit
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
100k
OUTPUT CODE
+5V
24k
-FS
1LSB =
FS = +2.048V
+4.096V
4096
510k
0.01µF
INPUT VOLTAGE (LSBs)
0V
12
REFADJ
MAX1202
+FS - 1LSB
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